Clay brick impregnation technology, clay brick, and application of clay brick

The invention discloses a clay brick impregnation technology, a clay brick, and an application of the clay brick. The technology concretely comprises the steps of phosphoric acid impregnation and surface treatment. The impregnation technology is regularly connected without a heat treatment process, so operating steps are simplified, the production efficiency is improved, the device investment is reduced, and the production cost investment is reduced; the phosphoric acid impregnated clay brick has a 20MPa higher compressive strength, 30-50DEG C higher refractoriness-under-load and 5% lower porosity than an unimpregnated clay brick, and a phosphate compound generated in the phosphoric acid impregnation process has excellent alkali erosion resistance, so the alkali erosion resistance of the clay brick is improved; and alkali erosion resistance experiments show that the compressive strength of the clay brick decreases by 30% or above after alkali erosion, and the compressive strength of the phosphoric acid impreg